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Kiryuu Moeka is a major character in the visual novel and 2011 anime Steins;Gate. The storyline of Steins;Gate revolves around Okabe Rintarou, a college student and self-proclaimed "mad scientist" living in Akihabara, Tokyo, who, along with his roommate and a few friends, inadveratantly discover the secret of time travel when they connect a cell phone to a microwave (yes, you read that right).
Kiryuu Moeka is a shy, quiet woman who prefers to text on her cell phone rather than talk, even when she is feet in front of the person she is communicating with. Moeka is initially friendly with Rintarou, but this is actually a ruse to allow her infiltrate Rintarou's "lab" under the orders of "SERN", an physics research organization (and obvious reference to CERN) who are involved in a secret plot to invent time travel and take over the world (OF COURSE!). Moeka attempts to take Rintarou captive, and in the process, kills one of the Rintarou's friends, a girl named Mayuri Shiina. Rintarou makes repeated time jumps in order to save Shiina and prevent to takeover of SERN. It is eventually revealed that Moeka is herself being manipulated by a SERN, and is later betrayed.